EP0860815A1 - Short-moment-arm head assembly and gimbal for floppy disk drives - Google Patents
Short-moment-arm head assembly and gimbal for floppy disk drives Download PDFInfo
- Publication number
- EP0860815A1 EP0860815A1 EP98102745A EP98102745A EP0860815A1 EP 0860815 A1 EP0860815 A1 EP 0860815A1 EP 98102745 A EP98102745 A EP 98102745A EP 98102745 A EP98102745 A EP 98102745A EP 0860815 A1 EP0860815 A1 EP 0860815A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gimbal
- flexure
- slider
- media
- finger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Definitions
- the invention relates generally to computer data storage systems and more specifically to devices to reduce the sensitivity of a floppy disk drive to media friction variations that can cause magnetic head squeal and pitch modulation.
- Double-sided recording on a floppy disk has been used to increase capacity and facilitate data transfer operations. As with most single-sided recording, pressure is required on the opposing side to urge the disk against the head.
- a typical double-sided contact system is disclosed by United States Patent 4,151,573, which describes a fixed head on one side of a disk and a cantilevered, gimbal-mounted, movable head on the other side. In operation, the disk is confined against the fixed head, despite perturbations in movement of the disk, by the pressure of the movable head.
- the disk is contained within a protective plastic jacket. A shutter on the jacket is moved aside to reveal a windowed opening through which the heads can contact the disk.
- the heads are ordinarily in direct opposition because the windows are small. Sometimes the heads have a slight radial offset with one another to avoid flux interaction.
- LS-120 drive and diskette
- Such disks e.g., a disk 10 in Fig. 1, have a hard plastic envelope 12 that protects a flexible media 14 inside.
- a metal shutter 16 allows access to the media 14 through a hole 18 in the plastic that is revealed by sliding the shutter 16 to one side against internal spring pressure.
- a magnetic head is flexibly mounted to a carriage using a resilient gimbal such that the head can follow the ups and downs on the surface of the medium to keep close contact.
- the carriage moves radial to the disk medium and carries the magnetic heads horizontally that are pressed against medium by the resilience of the gimbal.
- Such disks and their drives have experienced instability problems that can manifest as a squeal. This problem is generally caused by the relatively long moment arms created by not having the plane of the pivoted upper slider flexure as close as possible to the media. The higher rotation speeds of the newer technologies only exacerbate the squealing problem.
- Albrecht, et. al. describes in United States Patent 5,251,844, issued Oct. 12, 1993, a flexure that permits an upper plate to pivot, or "gimbal", with two degrees of freedom with respect to a post, e.g., pitch and roll.
- the pivoting occurs about a dimple that protrudes from a surface of a leaf spring, through an opening in the flexure, and into a recessed region of the upper plate.
- the leaf spring prevents the upper plate from rotating.
- Conventional floppy disk mechanisms include upper plates, flexures, leaf springs, and pivots that are similar to those originally appearing in IBM 3370 and 3380/3390 direct access storage device (DASD) head suspension assemblies.
- IBM Model 3370 disk drive announced in 1973, used so-called Whitney head technology, and the first thin film disk.
- Whitney head technology used so-called Whitney head technology
- Such thin film improved head and media performance, without lowering the flying heights.
- the head suspension assembly of the IBM 3380/3390 DASD see United States Patent 4,167,765, and Aoyagi et al., "Integrated Head Suspension Assembly", IBM TECHNICAL DISCLOSURE BULLETIN, Vol. 32, No. 3A, August 1989, pp. 175-176.
- Conventional microfloppy cartridges present a relatively deep well through an opening in the shutter 16 and the hole 18 that a magnetic head attached to an actuator arm in a drive must drop into and contact the media 14, e.g., from either side.
- the typical prior art head assembly has a gimbal on which is attached a mounting block that gains the needed extension. A magnetic read/write head is then attached at the distal end of the mounting block. A rather long moment arm is thereby setup between the plane of the gimbal and the contact point between the media 14 and the head.
- Such long moment arms have been responsible for audible squealing and pitch variations that are energized by the rubbing friction between the rotating media 14 and the stationary head, e.g., similar in effect to the tone produced by rubbing a wet finger around the rim of a wine glass.
- each head in a magnetic disk storage system is supported and connected to a flexure.
- Such flexures are typically connected to the free end of a predominantly flat, cantilevered suspension arm on a movable carriage associated with the disk.
- the suspension arm is conventionally spring-loaded to provide a vertical loading force on the head that urges the head to the disk surface.
- the substantially triangular loadbeam/spring element had flanges formed along its length to concentrate the resilient spring action at the opposite ends and to stiffen the remaining portion of the length.
- the stiff cross leg section of the rectangular flexure was crimped to detent the central finger to keep the attached slider parallel but elevated to accommodate the load pivot height from the load beam.
- a floppy disk drive embodiment of the present invention comprises a low-profile magnetic head slider mounted directly to a Whitney-type flexure.
- a suspension arm with a Z-bend in it to clear a cartridge shutter allows an attachment at the front end of the flexure to the metal suspension.
- the load force is applied to a dimple on the center of a flexure finger.
- the load point position and the Whitney-like flexure plane inside the shutter opening are substantially nearer to the disk media than they are to the top surface of the shutter.
- An advantage of the present invention is that a floppy disk drive is provided that operates the Whitney-gimbal assembly and its pivot and flexure substantially closer to the media surface and thus shortens the moment arm setup.
- a further advantage of the present invention is that the required minimum height swept out during cartridge insertion and ejection by the upper arm is significantly decreased. And yet the upper slider is assured to clear the top surface of the cartridge shutter.
- Such an upper arm configuration is very advantageous in low-profile drives used by portable computers.
- a still further advantage of the present invention is that the LS-120 and other high capacity drives benefit from the increased stability afforded and this increased stability can be used to decrease the load force and thus reduce media and slider wear.
- Figs. 2A and 2B illustrate a suspended head-gimbal assembly embodiment of the present invention, referred to herein by the general reference numeral 30.
- the suspended head-gimbal assembly 30 comprises a suspension 32, a Whitney-type gimbal flexure 34, and a low-profile magnetic head slider 36. These are all preferably adapted to fit a conventional floppy disk drive actuator.
- an actuate arm 38 has a pair of pivots 40 and 42 that allow it to teeter-totter on an actuator carriage in a microfloppy drive.
- the suspended head-gimbal assembly 30 mounts to the distal end of the actuator arm 38 and the teeter-totter action allows the suspended head-gimbal assembly 30 to be raised high enough to clear the shutter door of a microfloppy cartridge during insertion or ejection. Once the microfloppy cartridge is in place and its shutter door opened, the suspended head-gimbal assembly 30 is dropped into contact with the floppy disk media by turning the actuator arm 38 on its pivots 40 and 42.
- a Z-bend 44 in the suspension 32 places the plane of a gimbal attachment 46 at a minimal elevation above the floppy disk media. Such elevation is critical, and comparatively far less than conventional designs.
- the Whitney-type gimbal flexure 34 comprises a pair of leaf springs 48 and 50 and a central finger 52 with a load dimple 54.
- a load finger 56 that extends from the gimbal attachment 46 bears on the dimple 54 when the slider 36 is loaded on the floppy disk media.
- the leaf springs 48 and 50 allow such loading to occur easily and permit relatively free but controlled pitching and rolling of the slider 36 in its ride on the media.
- the Whitney-type gimbal flexure 34 is preferably oriented such that the leaf springs 48 and 50 are placed in tension by the direction of rotation and friction of the slider with the floppy disk media.
- Fig. 2B represents the amount in elevation that the plane of gimbal flexure is dropped by a dimension A " .
- the thickness of the slider 36 is represented by a dimension B " .
- the Z-bend 44 therefore permits dimension B " to be minimized and yet allows dimensions A “ and B “ to be sufficiently large to provide for the arm 38 and the attachment to suspension 32 to clear the perimeter of the microfloppy disk shutter opening.
- dimension B " is substantially larger, and media friction combined with the larger moment arm creates an instability and squeal to develop when the slider 36 yaws and pitches on the load dimple 54.
- the magnetic head slider 36 is attached directly to the Whitney-type flexure 34.
- the conventional intervening extension block is not needed in order to reach the head deep enough through the hole 18 in the diskette 10 to access the media 14.
- the Whitney-type flexure 34 accompanies the magnetic head slider 36 into the recesses of the diskette 10.
- a microfloppy disk drive embodiment of the present invention referred to herein by the general reference numeral 50, has the microfloppy diskette 10 of Fig. 1 already installed.
- the arm 38 has been rotated forward on pivots 40 and 42 to bring the slider 36 into contact with the disk media 18.
- Most such drives will be double-sided, but Figs. 3A and 3B do not show the other head assembly in order to keep the illustration from becoming too cluttered.
- the gimbal 34 attached to gimbal attachment 46 has a relatively low altitude above the disk media 18, as represented by a dimension C " . It is from this altitude that the slider pitches and rolls, and so dimension C " represents the length of the moment arm that can be involved in squealing.
- a dimension D " represents the typical altitude that conventional disk drives position their gimbals. Such higher altitudes are the result of thicker high profile sliders, and/or elevator blocks placed intermediate to the slider and gimbal. The prior art uses such a configuration to provide for a clearance between the arm and the shutter 16.
- Fig. 3B the arm 38 has been rotated back on pivots 40 and 42 to raise the slider 36 away from contact with the disk media 18, and high enough to clear the shutter 16 when the microfloppy diskette 10 is withdrawn.
- the altitude that the slider 36 is lifted is represented by a dimension E " .
Landscapes
- Moving Of Heads (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
Abstract
A microfloppy disk drive embodiment of the
present invention comprises a low-profile magnetic
head slider (36) mounted directly to a Whitney-type
flexure (34). A suspension arm (32) with a Z-bend (44) in its
distal end is configured to clear a cartridge
shutter, and such further allows an attachment at
the front end of the flexure (32) to the metal
suspension (34). The load force is applied to a dimple (54)
on the center of a flexure finger. In contrast to
the prior art, the load point position and the
Whitney-like flexure plane inside the shutter
opening are substantially nearer to the disk media
than they are to the top surface of the shutter.
Description
The invention relates generally to computer
data storage systems and more specifically to
devices to reduce the sensitivity of a floppy disk
drive to media friction variations that can cause
magnetic head squeal and pitch modulation.
Double-sided recording on a floppy disk has
been used to increase capacity and facilitate data
transfer operations. As with most single-sided
recording, pressure is required on the opposing
side to urge the disk against the head. A typical
double-sided contact system is disclosed by United
States Patent 4,151,573, which describes a fixed
head on one side of a disk and a cantilevered,
gimbal-mounted, movable head on the other side. In
operation, the disk is confined against the fixed
head, despite perturbations in movement of the
disk, by the pressure of the movable head.
Typically, the disk is contained within a
protective plastic jacket. A shutter on the jacket
is moved aside to reveal a windowed opening through
which the heads can contact the disk. For double-sided
recording the heads are ordinarily in direct
opposition because the windows are small.
Sometimes the heads have a slight radial offset
with one another to avoid flux interaction.
The standard 3.5" microfloppy disk is now
ubiquitous and familiar to most lay persons in the
United States. Recently, the so-called high
capacity LS-120" drive and diskette has been
introduced which uses a cartridge and shutter about
the same as conventional floppies. Such disks,
e.g., a disk 10 in Fig. 1, have a hard plastic
envelope 12 that protects a flexible media 14
inside. A metal shutter 16 allows access to the
media 14 through a hole 18 in the plastic that is
revealed by sliding the shutter 16 to one side
against internal spring pressure. In conventional
disk drives, a magnetic head is flexibly mounted to
a carriage using a resilient gimbal such that the
head can follow the ups and downs on the surface of
the medium to keep close contact. The carriage
moves radial to the disk medium and carries the
magnetic heads horizontally that are pressed
against medium by the resilience of the gimbal.
Such disks and their drives have experienced
instability problems that can manifest as a squeal.
This problem is generally caused by the relatively
long moment arms created by not having the plane of
the pivoted upper slider flexure as close as
possible to the media. The higher rotation speeds
of the newer technologies only exacerbate the
squealing problem.
Albrecht, et. al., describes in United States
Patent 5,251,844, issued Oct. 12, 1993, a flexure
that permits an upper plate to pivot, or "gimbal",
with two degrees of freedom with respect to a post,
e.g., pitch and roll. The pivoting occurs about a
dimple that protrudes from a surface of a leaf
spring, through an opening in the flexure, and into
a recessed region of the upper plate. The leaf
spring prevents the upper plate from rotating.
Conventional floppy disk mechanisms include
upper plates, flexures, leaf springs, and pivots
that are similar to those originally appearing in
IBM 3370 and 3380/3390 direct access storage device
(DASD) head suspension assemblies. The earlier IBM
Model 3370 disk drive, announced in 1973, used so-called
Whitney head technology, and the first thin
film disk. Such thin film improved head and media
performance, without lowering the flying heights.
For further description of the head suspension
assembly of the IBM 3380/3390 DASD, see United
States Patent 4,167,765, and Aoyagi et al.,
"Integrated Head Suspension Assembly", IBM
TECHNICAL DISCLOSURE BULLETIN, Vol. 32, No. 3A,
August 1989, pp. 175-176.
Conventional microfloppy cartridges present a
relatively deep well through an opening in the
shutter 16 and the hole 18 that a magnetic head
attached to an actuator arm in a drive must drop
into and contact the media 14, e.g., from either
side. The typical prior art head assembly has a
gimbal on which is attached a mounting block that
gains the needed extension. A magnetic read/write
head is then attached at the distal end of the
mounting block. A rather long moment arm is
thereby setup between the plane of the gimbal and
the contact point between the media 14 and the
head. Such long moment arms have been responsible
for audible squealing and pitch variations that are
energized by the rubbing friction between the
rotating media 14 and the stationary head, e.g.,
similar in effect to the tone produced by rubbing a
wet finger around the rim of a wine glass.
Anderson, et al., explain in United States
Patent 4,535,374, issued August 13, 1985, that each
head in a magnetic disk storage system is supported
and connected to a flexure. Such flexures are
typically connected to the free end of a
predominantly flat, cantilevered suspension arm on
a movable carriage associated with the disk. The
suspension arm is conventionally spring-loaded to
provide a vertical loading force on the head that
urges the head to the disk surface.
Robert B. Watrous observed in United States
Patent 4,167,765, issued September 11, 1979, that
in order to have a magnetic transducer closely
follow a moving disk surface, the head slider and
its supporting suspension should be able to pitch
around a first axis and to roll about a second axis
orthogonal to the first axis. He constructed the
so-called Whitney magnetic head/arm assembly for
IBM with a suspension for an air bearing head
slider that included a single piece rectangular
flexure with two parallel flexible narrow fingers,
a relatively stiff cross leg, and a central finger
to which the slider was attached. A combined load
beam-spring element was formed from a single piece
and fastened to the flexure so as to engage a load
pivot formed with the central finger. The
substantially triangular loadbeam/spring element
had flanges formed along its length to concentrate
the resilient spring action at the opposite ends
and to stiffen the remaining portion of the length.
The stiff cross leg section of the rectangular
flexure was crimped to detent the central finger to
keep the attached slider parallel but elevated to
accommodate the load pivot height from the load
beam.
It is therefore an object of the present
invention to provide a floppy disk drive with
reduced or eliminated squeal due to disk and head
rubbing friction on a long head-flexure moment arm.
It is another object of the present invention
to provide a top slider gimbal assembly with better
control in a floppy disk drive of the head pitch
and roll vibrations that can be caused by disk and
head rubbing friction on a long head-flexure moment
arm.
Briefly, a floppy disk drive embodiment of the
present invention comprises a low-profile magnetic
head slider mounted directly to a Whitney-type
flexure. A suspension arm with a Z-bend in it to
clear a cartridge shutter allows an attachment at
the front end of the flexure to the metal
suspension. The load force is applied to a dimple
on the center of a flexure finger. The load point
position and the Whitney-like flexure plane inside
the shutter opening are substantially nearer to the
disk media than they are to the top surface of the
shutter.
An advantage of the present invention is that
a floppy disk drive is provided that operates the
Whitney-gimbal assembly and its pivot and flexure
substantially closer to the media surface and thus
shortens the moment arm setup.
A further advantage of the present invention
is that the required minimum height swept out
during cartridge insertion and ejection by the
upper arm is significantly decreased. And yet the
upper slider is assured to clear the top surface of
the cartridge shutter. Such an upper arm
configuration is very advantageous in low-profile
drives used by portable computers.
A still further advantage of the present
invention is that the LS-120 and other high
capacity drives benefit from the increased
stability afforded and this increased stability can
be used to decrease the load force and thus reduce
media and slider wear.
These and many other objects and advantages of
the present invention will no doubt become obvious
to those of ordinary skill in the art after having
read the following detailed description of the
preferred embodiments which are illustrated in the
various drawing figures.
Figs. 2A and 2B illustrate a suspended head-gimbal
assembly embodiment of the present
invention, referred to herein by the general
reference numeral 30. The suspended head-gimbal
assembly 30 comprises a suspension 32, a Whitney-type
gimbal flexure 34, and a low-profile magnetic
head slider 36. These are all preferably adapted
to fit a conventional floppy disk drive actuator.
For example, an actuate arm 38 has a pair of pivots
40 and 42 that allow it to teeter-totter on an
actuator carriage in a microfloppy drive. The
suspended head-gimbal assembly 30 mounts to the
distal end of the actuator arm 38 and the teeter-totter
action allows the suspended head-gimbal
assembly 30 to be raised high enough to clear the
shutter door of a microfloppy cartridge during
insertion or ejection. Once the microfloppy
cartridge is in place and its shutter door opened,
the suspended head-gimbal assembly 30 is dropped
into contact with the floppy disk media by turning
the actuator arm 38 on its pivots 40 and 42.
A Z-bend 44 in the suspension 32 places the
plane of a gimbal attachment 46 at a minimal
elevation above the floppy disk media. Such
elevation is critical, and comparatively far less
than conventional designs.
The Whitney-type gimbal flexure 34 comprises a
pair of leaf springs 48 and 50 and a central finger
52 with a load dimple 54. A load finger 56 that
extends from the gimbal attachment 46 bears on the
dimple 54 when the slider 36 is loaded on the
floppy disk media. The leaf springs 48 and 50
allow such loading to occur easily and permit
relatively free but controlled pitching and rolling
of the slider 36 in its ride on the media. The
Whitney-type gimbal flexure 34 is preferably
oriented such that the leaf springs 48 and 50 are
placed in tension by the direction of rotation and
friction of the slider with the floppy disk media.
Fig. 2B represents the amount in elevation
that the plane of gimbal flexure is dropped by a
dimension A". The thickness of the slider 36 is
represented by a dimension B". The Z-bend 44
therefore permits dimension B" to be minimized and
yet allows dimensions A" and B" to be
sufficiently large to provide for the arm 38 and
the attachment to suspension 32 to clear the
perimeter of the microfloppy disk shutter opening.
In the prior art, dimension B" is substantially
larger, and media friction combined with the larger
moment arm creates an instability and squeal to
develop when the slider 36 yaws and pitches on the
load dimple 54.
One way that the present invention differs
from the prior art is that the magnetic head slider
36 is attached directly to the Whitney-type flexure
34. The conventional intervening extension block
is not needed in order to reach the head deep
enough through the hole 18 in the diskette 10 to
access the media 14. In the present invention, the
Whitney-type flexure 34 accompanies the magnetic
head slider 36 into the recesses of the diskette
10.
In Fig. 3A, a microfloppy disk drive
embodiment of the present invention, referred to
herein by the general reference numeral 50, has the
microfloppy diskette 10 of Fig. 1 already
installed. The arm 38 has been rotated forward on
pivots 40 and 42 to bring the slider 36 into
contact with the disk media 18. Most such drives
will be double-sided, but Figs. 3A and 3B do not
show the other head assembly in order to keep the
illustration from becoming too cluttered. When
loaded in this way, the gimbal 34 attached to
gimbal attachment 46 has a relatively low altitude
above the disk media 18, as represented by a
dimension C". It is from this altitude that the
slider pitches and rolls, and so dimension C"
represents the length of the moment arm that can be
involved in squealing. A dimension D" represents
the typical altitude that conventional disk drives
position their gimbals. Such higher altitudes are
the result of thicker high profile sliders, and/or
elevator blocks placed intermediate to the slider
and gimbal. The prior art uses such a
configuration to provide for a clearance between
the arm and the shutter 16.
In Fig. 3B, the arm 38 has been rotated back
on pivots 40 and 42 to raise the slider 36 away
from contact with the disk media 18, and high
enough to clear the shutter 16 when the microfloppy
diskette 10 is withdrawn. The altitude that the
slider 36 is lifted is represented by a dimension
E".
Although the present invention has been
described in terms of the presently preferred
embodiments, it is to be understood that the
disclosure is not to be interpreted as limiting.
Various alterations and modifications will no doubt
become apparent to those skilled in the art after
having read the above disclosure. Accordingly, it
is intended that the appended claims be interpreted
as covering all alterations and modifications as
fall within the true spirit and scope of the
invention.
Claims (7)
- A head-gimbal-suspension assembly for a floppy disk drive, comprising:a Whitney-type gimbal flexure generally flat and rectangular in shape and having a central flexible flat finger extended from a media rotation downstream end and a pair of leaf springs outboard of said finger extended from said media rotation downstream end to an opposite upstream end;a low-profile magnetic head slider directly attached to a distal end of said flexible flat finger; anda suspension having a Z-bend with a first end with a higher elevation relative to the slider for attachment to an actuator arm and a second end with a lower elevation than said first end relative to the slider with a gimbal attachment that supports said upstream end of the gimbal flexure;
wherein, said pair of leaf springs are placed in tension during operation; and
wherein, a foreshortened moment arm is provided between the gimbal flexure and a media contact side of the low-profile magnetic head slider to control squeal. - The assembly of claim 1, wherein:said foreshortened moment arm is less than a depth of entry from a shutter window on a mating floppy diskette to a magnetic flexible disk media within.
- A floppy disk drive system, comprising:an actuator arm with pivots that allow clearance for the insertion and ejection of a microfloppy diskette with a rigid body and a shutter window access to a flexible disk media disposed within;a Whitney-type gimbal flexure generally flat and rectangular in shape and having a central flexible flat finger extended from a first end and a pair of leaf springs outboard of said finger extended from said first end to a second end;a low-profile magnetic head slider directly attached to a distal end of said flexible flat finger; anda suspension having a Z-bend with a first end with a higher elevation relative to the slider attached to a distal end of the actuator arm, and a second end with a lower elevation than said first end relative to the slider with a gimbal attachment that supports said second end of the gimbal flexure.
- The system of claim 3, wherein;said flexible disk media is rotated in a direction that will place said pair of leaf springs in tension during operation.
- The system of claim 3, wherein;wherein, a foreshortened moment arm is provided between the gimbal flexure and a media contact side of the low-profile magnetic head slider to control squeal.
- The system of claim 3, wherein;the suspension includes a load finger that extends from said second end toward said first end of the gimbal; andthe gimbal includes on said central finger a load dimple that bears on said load finger during operation.
- A method for limiting audible squeal and head pitch and roll vibrations in head-gimbal assemblies for floppy disk drives, the method comprising:positioning a two-degrees of freedom pivot point of a flexure to operate in the space between a shutter window opening and a flexible disk media in a hard floppy diskette envelope, and that provides for a foreshortened moment arm between said pivot point and a media contact with a low-profile magnetic head slider attached to said flexure, wherein is provided a means of controlling pitch and roll vibration and audible squeal.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US80184797A | 1997-02-21 | 1997-02-21 | |
US801847 | 1997-02-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0860815A1 true EP0860815A1 (en) | 1998-08-26 |
Family
ID=25182175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98102745A Withdrawn EP0860815A1 (en) | 1997-02-21 | 1998-02-17 | Short-moment-arm head assembly and gimbal for floppy disk drives |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0860815A1 (en) |
JP (1) | JPH10241257A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6088201A (en) * | 1997-03-21 | 2000-07-11 | Alps Electric Co., Ltd. | Magnetic head device |
US6466411B1 (en) | 1999-08-09 | 2002-10-15 | Alps Electric Co., Ltd. | Magnetic head device supported by a bent load beam |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000357361A (en) * | 1999-06-15 | 2000-12-26 | Alps Electric Co Ltd | Head carriage deivce |
US8996143B2 (en) * | 2011-09-06 | 2015-03-31 | Western Digital Technologies, Inc. | System and method to align a boss of a head gimbal assembly to a boss hole of an actuator arm for disk drive assembly |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4167765A (en) * | 1978-07-27 | 1979-09-11 | International Business Machines Corporation | Transducer suspension mount apparatus |
DE2948147A1 (en) * | 1978-12-01 | 1980-06-19 | Hitachi Ltd | MAGNETIC HEAD FOR RECORDING AND PLAYING BACK SIGNALS |
JPS5668921A (en) * | 1979-11-06 | 1981-06-09 | Fujitsu Ltd | Control method for slider inclination of magnetic head |
EP0714094A1 (en) * | 1994-11-20 | 1996-05-29 | Sony Corporation | Magnetic head device and magneto-optical recording device |
JPH09265738A (en) * | 1996-03-29 | 1997-10-07 | Hitachi Ltd | Head supporting mechanism and information recorder |
-
1998
- 1998-02-17 EP EP98102745A patent/EP0860815A1/en not_active Withdrawn
- 1998-02-20 JP JP3902498A patent/JPH10241257A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4167765A (en) * | 1978-07-27 | 1979-09-11 | International Business Machines Corporation | Transducer suspension mount apparatus |
DE2948147A1 (en) * | 1978-12-01 | 1980-06-19 | Hitachi Ltd | MAGNETIC HEAD FOR RECORDING AND PLAYING BACK SIGNALS |
JPS5668921A (en) * | 1979-11-06 | 1981-06-09 | Fujitsu Ltd | Control method for slider inclination of magnetic head |
EP0714094A1 (en) * | 1994-11-20 | 1996-05-29 | Sony Corporation | Magnetic head device and magneto-optical recording device |
JPH09265738A (en) * | 1996-03-29 | 1997-10-07 | Hitachi Ltd | Head supporting mechanism and information recorder |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 005, no. 130 (P - 076) 20 August 1981 (1981-08-20) * |
PATENT ABSTRACTS OF JAPAN vol. 098, no. 002 30 January 1998 (1998-01-30) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6088201A (en) * | 1997-03-21 | 2000-07-11 | Alps Electric Co., Ltd. | Magnetic head device |
US6466411B1 (en) | 1999-08-09 | 2002-10-15 | Alps Electric Co., Ltd. | Magnetic head device supported by a bent load beam |
Also Published As
Publication number | Publication date |
---|---|
JPH10241257A (en) | 1998-09-11 |
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